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| 型號： | ADM1033ARQ-REEL |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 11/39頁 |
| 文件大?。?/td> | 819K |
| 代理商： | ADM1033ARQ-REEL |
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ADM1033
Rev. 0 | Page 19 of 40
LAYOUT CONSIDERATIONS
Digital boards can be electrically noisy environments. Be sure to
protect the analog inputs from noise, particularly when
measuring the very small voltages from a remote diode sensor.
Take the following precautions:
Place the ADM1033 as close as possible to the remote
sensing diode. A distance of 4 inches to 8 inches is
adequate, provided that the worst noise sources such as
clock generators, data/address buses, and CRTs are avoided.
Route the D+ and D tracks close together, in parallel, with
grounded guard tracks on each side. Provide a ground
plane under the tracks if possible.
Use wide tracks to minimize inductance and reduce noise
pickup. A minimum of 5 mil track width and spacing is
recommended.
Try to minimize the number of copper/solder joints, which
can cause thermocouple effects. Where copper/ solder
joints are used, make sure that they are in both the D+ and
D path and at the same temperature. Thermocouple
effects should not be a major problem because 1°C
corresponds to about 200 V, and thermocouple voltages
are about 3 V/°C of temperature difference. Unless there
are two thermocouples with a big temperature differential
between them, thermocouple voltages should be much less
than 200 V.
5MIL
GND
D+
GND
D–
04
93
7-
0-
02
8
Figure 29. Arrangement of Signal Tracks
Place a 0.1 F bypass capacitor close to the ADM1033.
If the distance to the remote sensor is more than 8 inches,
twisted pair cable is recommended. This works up to about
6 feet to 12 feet.
For very long distances (up to 100 feet), use shielded
twisted pair such as Belden #8451 microphone cable.
Connect the twisted pair to D+ and D and the shield to
GND, close to the ADM1033. Leave the remote end of the
shield unconnected to avoid ground loops.
Because the measurement technique uses switched current
sources, excessive cable and/or filter capacitance can affect the
measurement. When using long cables, the filter capacitor C1
may be reduced or removed. In any case, the total shunt
capacitance should never exceed 1000 pF.
Noise Filtering
For temperature sensors operating in noisy environments,
common practice is to place a capacitor across the D+ and D
pins to help combat the effects of noise. However, large capacitan-
ces affect the accuracy of the temperature measurement, leading
to a recommended maximum capacitor value of 1000 pF.While
this capacitor reduces the noise, it does not eliminate it, making it
difficult to use the sensor in a very noisy environment.
The ADM1033 has a major advantage over other devices when
it comes to eliminating the effects of noise on the external sen-
sor. The series resistance cancellation feature allows a filter to be
constructed between the external temperature sensor and the
part. The effect of any filter resistance seen in series with the remote
sensor is automatically cancelled from the temperature result.
The construction of a filter allows the ADM1033 and the
remote temperature sensor to operate in noisy environments.
Figure 30 shows a low-pass R-C-R filter with the following
values: R = 100 and C = 1 nF. This filtering reduces both
common-mode noise and differential noise.
04110-0-009
D+
1nF
100
REMOTE
TEMPERATURE
SENSOR
D–
100
Figure 30. Filter Between Remote Sensor and ADM1033
Rev. 1 | Page 19 of 39 | www.onsemi.com
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